Modification to the Lattice of the Fermilab Debuncher Ring to Improve the Performance of the Stochastic Cooling Systems

The Fermilab Debuncher is used to collect antiprotons from the production target, reduce the momentum spread of the beam by an RF bunch rotation, and stochastically cool the transverse and longitudinal emittances of the beam prior to transfer to the Accumulator. A small value of the slip factor η of the ring lattice is favored to provide a larger momentum acceptance for the bunch rotation process, while a large value is desirable for stochastic cooling. A dynamic change in the lattice from a small slip factor at injection to a larger slip factor at extraction would optimize both processes and could lead to an improvement in antiproton stacking rate. This paper discusses the details of lattice modifications to the Debuncher, achievable with the existing hardware, which would result in a 60% increase in the slip factor, while maintaining the tunes and chromaticities fixed, and keeping the betatron functions within an acceptable range.